Flexible pin testing device

Abstract

The utility model relates to the technical field of flexible pins, in particular to a flexible pin testing device which comprises a base, a mounting frame, a loading mechanism and a tested assembly. The tested assembly comprises a planet carrier, a pin shaft and a pin sleeve, the planet carrier is arranged on the base, one end of the pin shaft is arranged in the planet carrier in a penetrating mode and is in interference connection with the planet carrier, and one end of the pin shaft is arranged in the pin sleeve in a penetrating mode and is in interference connection with the pin sleeve; the loading mechanism is arranged on the mounting frame and is used for applying a test load to the tested component; and the loading mechanism is externally connected with test equipment for analyzing deformation and fatigue. The device can be suitable for interference fitting micro deformation and fatigue checking tests of the flexible pin shaft, the actual working state is simulated, load loading is provided, and the design correctness and reliability of the flexible pin are verified.

Description

Technical Field

[0001] This application relates to the technical field of flexible pins, and particularly to a flexible pin test device. Background Art

[0002] The use of flexible pins for planetary gear shafts is an effective method for achieving load sharing in heavy-duty planetary transmissions. This structure realizes load sharing through the elastic deformation complementarity of cantilever beams, and can reduce the transmission of impact loads in the system, thereby improving the reliability of the planetary transmission system. Due to its significant effect on the load sharing effect of multi-branch planetary and the improvement of torque density, it has been gradually adopted by extra-large megawatt-level wind turbine gearboxes.

[0003] For key indicators of flexible pin shaft design, such as deformation and fatigue, there is no general theoretical calculation method, and currently, the finite element method is mostly used. Flexible pin shafts have characteristics such as many components and complex structures, involving many non-linear factors. There is a certain deviation between the simulation calculation results and the actual use situation, and currently, the fatigue strength check is mainly for the tensile or bending fatigue of the main structure. There are difficulties in the interference fit micro-deformation and fatigue check, and it can only be verified through experiments. Therefore, how to provide a test device for the interference fit micro-deformation and fatigue check of flexible pin shafts, simulate the actual working state, provide load loading, and verify the design correctness and reliability of flexible pins has become an urgent problem to be solved. Utility Model Content

[0004] In order to provide a test device for the interference fit micro-deformation and fatigue check of flexible pin shafts, simulate the actual working state, provide load loading, and verify the design correctness and reliability of flexible pins, this application provides a flexible pin test device.

[0005] The flexible pin test device provided by this application adopts the following technical solutions:

[0006] A flexible pin test device includes a base, a mounting frame, a loading mechanism, and a component to be tested;

[0007] The component to be tested includes a planet carrier, a pin shaft, and a bushing. The planet carrier is arranged on the base. One end of the pin shaft passes through the planet carrier and is in interference fit with the planet carrier. One end of the pin shaft passes through the bushing and is in interference fit with the bushing;

[0008] The loading mechanism is arranged on the mounting frame to apply a test load to the component to be tested, and the loading mechanism is externally connected to a test device for analyzing deformation and fatigue.

[0009] By adopting the above technical solutions, when verifying the design correctness and reliability of the flexible pin, the tested component is assembled, and a specified test load is applied to the tested component through the loading mechanism to simulate the actual working condition. The test equipment connected to the loading mechanism then detects and analyzes according to the applied test load situation, so as to form the deformation and fatigue analysis results, and realize the verification of the design correctness and reliability of the flexible pin. The test equipment can be selected and connected according to the actual situation, which belongs to the prior art and will not be elaborated in this application.

[0010] Optionally, a guiding boss is arranged on the top surface of the base, and a guiding groove for the guiding boss to pass through and slide is formed on the bottom surface of the planet carrier.

[0011] By adopting the above technical solutions, it is convenient to quickly position the planet carrier during installation, and ensure that the axis of the pin shaft is consistent with the symmetry center of the test device.

[0012] Optionally, an adjusting seat is fixedly installed on the base, an adjusting screw is arranged on the adjusting seat, a threaded hole is formed on the side of the planet carrier far from the pin sleeve, and the adjusting screw passes through the threaded hole and is threadedly connected with the threaded hole.

[0013] By adopting the above technical solutions, the threaded hole is used to adjust the axial position of the planet carrier. During the test, the axial position of the planet carrier can be adjusted to make the loading center of the force axially offset, so as to simulate the eccentric load in the axial direction received by the pin sleeve during actual operation.

[0014] Optionally, a rectangular groove and two U-shaped grooves are formed on one side of the adjusting seat. The rectangular groove is located between the two U-shaped grooves, and the rectangular groove penetrates through the top surface and the bottom surface of the adjusting seat;

[0015] One of the U-shaped grooves is fixedly connected to the base through a bolt, and the other U-shaped groove is penetrated by the adjusting screw; a hexagonal head and a screw shaft shoulder are arranged on the adjusting screw, and the screw shaft shoulder is limited in the rectangular groove.

[0016] By adopting the above technical solutions, the hexagonal head is convenient for screwing the adjusting screw, and the screw shaft shoulder is placed in the rectangular groove of the adjusting seat for axial limit. When the adjusting screw is rotated, the axial position of the planet carrier can be adjusted due to the action of the thread.

[0017] Optionally, a pressing plate is connected to the base through a lead screw. The lead screws are arranged at the four corners of the base, and the pressing plate is located above the planet carrier and is used to press the planet carrier against the base;

[0018] The lead screw includes a screw rod, a screw sleeve and a buckle. The screw sleeve passes through the base and is fixedly connected with the base. The bottom end of the screw rod is threadedly connected to the screw sleeve, and a limit shaft shoulder and a hexagonal boss are arranged at the upper end of the screw rod. The hexagonal boss is located above the limit shaft shoulder;

[0019] The snap fastener is clamped on the lead screw and above the limiting shoulder, and the pressing plate is located between the snap fastener and the hexagonal boss.

[0020] By adopting the above technical solution, the hexagonal head boss is convenient for using tools to turn. During assembly, after the lead screw 201 passes through the through hole on the pressing plate, the snap fastener is installed at the limiting shoulder to fix the pressing plate and the lead screw. By turning the hexagonal head boss above the lead screw, the screwing length of the lead screw and the lead nut can be adjusted, and the distance between the pressing plate and the base can be changed, so as to adapt to planet carriers and pin shafts of different sizes.

[0021] Optionally, the snap fastener is of a split structure and is connected by bolts.

[0022] By adopting the above technical solution, the installation is simple and convenient.

[0023] Optionally, the mounting frame includes a cross beam and columns. A plurality of groups of bolt holes are provided on the columns along the height direction of the columns, and both ends of the cross beam are detachably connected to the bolt holes by bolts; the loading mechanism is arranged on the bottom surface of the cross beam and faces the pin sleeve.

[0024] Optionally, the loading mechanism includes a hydraulic cylinder, a hinge pair and a loading sleeve;

[0025] The hydraulic cylinder is fixedly connected to the bottom surface of the cross beam;

[0026] The hinge pair includes an upper connecting seat, a lower connecting seat, a cylindrical pin and a circlip. The upper connecting seat is fixedly connected to the piston rod of the hydraulic cylinder. The cylindrical pin passes through the upper connecting seat and the lower connecting seat, and both ends of the cylindrical pin are limited by circlips;

[0027] The upper end surface of the loading sleeve is attached to the lower end surface of the lower connecting seat, and the loading sleeve is sleeved on the pin sleeve.

[0028] By adopting the above technical solution, the hydraulic cylinder provides a direct test load, which can not only achieve static multi-stage loading and pressure holding, but also provide a high-frequency dynamic load for fatigue load application. The test pieces within a certain size range can be satisfied within the stroke range of the hydraulic cylinder. When the stroke of the hydraulic cylinder exceeds the maximum range, the connection position between the cross beam and the columns can be adjusted up and down according to different bolt holes, so as to adapt to test components of a wider range of different models and sizes.

[0029] There is only a degree of freedom of rotation around the cylindrical pin between the upper connecting seat and the lower connecting seat. On the one hand, when there is a slight misalignment between the vertical axis of the hydraulic cylinder and the horizontal axis of the pin shaft due to processing or installation errors, that is, the two axes are not in the same plane, it can prevent the loading sleeve from rotating around the bushing and maintain the stability of the device. On the other hand, the support of the pin shaft and the bushing belongs to a cantilever structure. After the load is applied, the axis will inevitably tilt slightly. The lower connecting seat of the hinge pair will automatically adapt and rotate around the cylindrical pin to ensure that the lower end surface of the lower connecting seat and the upper end surface of the loading sleeve always remain in contact and no additional load is generated.

[0030] Optionally, the loading sleeve is semicircularly arranged. The inner diameter of the loading sleeve is adapted to the outer diameter of the bushing, and the outer diameter of the loading sleeve is adapted to the root circle diameter of the planetary gear.

[0031] Optionally, a shoulder is provided at one end of the bushing close to the planet carrier, and one end of the loading sleeve close to the planet carrier abuts against the shoulder; a machining ring groove is provided in the loading sleeve at the non-bearing position.

[0032] By adopting the above technical solution, the area with the same width as the planetary gear bearing is reserved to contact the bushing to simulate the actual working state.

[0033] In summary, the present application includes at least one of the following beneficial technical effects:

[0034] 1. The test device of the present application has strong versatility and can be freely adjusted in the vertical direction at both the support end and the loading end. The distance between the support end base and the pressing plate is adjusted by a lead screw, and the loading end is adjusted by the installation position of the cross beam on the column and the stroke of the hydraulic cylinder itself, and can adapt to flexible pins of different model sizes;

[0035] 2. By setting a guide groove and an adjusting screw between the base and the planet carrier, the axial flexible movement of the flexible pin shaft assembly is achieved, and the eccentric load is loaded in the axial direction to simulate the actual working condition;

[0036] 3. The loading end has a reasonable degree of freedom in structure. A hinge pair connection with a single degree of freedom is added between the hydraulic cylinder and the loading sleeve to ensure the stability of the device when there is a slight misalignment between the axes of the flexible pin assembly and the loading assembly; at the same time, after the bushing is deformed under load, the loading sleeve can follow the deflection and no secondary additional load is generated, ensuring the accuracy of the test. Description of the Drawings

[0037] Figure 1 is the isometric view of a flexible pin test device according to an embodiment of the present application.

[0038] Figure 2 is the right side view of the test device.

[0039] Figure 3 is Figure 2 the sectional view of

[0040] Figure 4 It is a schematic structural diagram of a lead screw assembly;

[0041] Figure 5 It is a side view of the adjusting seat shaft.

[0042] Description of reference numerals: 1. Base; 101. Guide boss; 2. Lead screw; 201. Screw rod; 202. Screw sleeve; 203. Snap; 3. Pressure plate; 4. Column; 5. Cross beam; 6. Hydraulic cylinder; 7. Hinge pair; 701. Upper connecting seat; 702. Lower connecting seat; 703. Cylindrical pin; 704. Circlip; 8. Loading sleeve; 801. Machined ring groove; 9. Planet carrier; 901. Guide groove; 902. Screw hole; 10. Pin shaft; 11. Pin sleeve; 12. Adjusting seat; 1201. U-shaped groove; 1202. Rectangular groove; 13. Adjusting screw; 1301. Screw shaft shoulder. Detailed implementation manners

[0043] The following further elaborates on this application Figures 1-5 in conjunction with the accompanying drawings.

[0044] An embodiment of this application discloses a flexible pin test device. As Figure 1 and Figure 2 shown, the flexible pin test device includes a base 1, a lead screw 2, a pressure plate 3, a column 4, a cross beam 5, a hydraulic cylinder 6, a hinge pair 7, a loading sleeve 8, a planet carrier 9, a pin shaft 10, a pin sleeve 11, an adjusting seat 12, and an adjusting rod 13.

[0045] As Figure 2 shown, the pin shaft 10 and the pin sleeve 11 are connected by interference fit, and the pin shaft 10 and the planet carrier 9 are connected by interference fit. After the three are assembled, they serve as the component to be tested. The interference amount of the connection is the same as that of the actual product. A guide groove 901 and a screw hole 902 as shown in Figure 3 are provided below the planet carrier 9. The guide groove 901 is used for quick positioning during installation to ensure that the axis of the pin shaft 9 is consistent with the symmetry center of the test device. The screw hole 902 is used to adjust the axial position of the planet carrier 9. During the test, the axial position of the planet carrier 9 can be adjusted so that the force loading center is axially offset, simulating the eccentric load in the axial direction on the pin sleeve 10 during actual operation.

[0046] As Figure 1 shown, the base 1 is welded by several steel plates, and the bottom plate of the base 1 is connected to the foundation by bolts. A planet carrier guide boss 101 is provided above the base 1. The guide boss 101 and the guide groove 901 of the planet carrier 9 have the same dimensions and are used to support and position the planet carrier 9.

[0047] As Figure 5As shown in the figure, two U-shaped grooves 1201 and a rectangular groove 1202 are provided on the adjusting seat 12. The U-shaped groove 1201 below the adjusting seat 12 is fixed to the base 1 by bolts. As Figure 1 and Figure 3 shown, one end of the adjusting screw 13 is provided with a thread and is connected to the planet carrier 9. The thread size matches the screw hole 902 on the planet carrier 9. The other end is provided with a hexagon head for facilitating the turning of the adjusting rod. A screw shaft shoulder 1301 is provided in the middle of the adjusting rod 13. The shaft shoulder 1301 is placed in the rectangular groove 1201 of the adjusting seat 12 for axial limitation. When the adjusting rod 13 is rotated, the axial position of the planet carrier 9 can be adjusted due to the effect of the thread.

[0048] As Figure 1 shown, the base 1 and the pressing plate 3 are connected by four groups of lead screws 2. The lower surface of the pressing plate 3 is in contact with the upper surface of the planet carrier 9, which is used to limit the displacement of the planet carrier 9 when the pin sleeve 11 is loaded. As Figure 4 shown, the lead screw 2 is composed of a screw rod 201, a nut sleeve 202, and a buckle 203. The screw rod 201 and the nut sleeve 202 are connected by threads. A hexagon head boss is provided above the screw rod 201, which is convenient for using tools to turn. The nut sleeve 202 passes through the through hole on the base, and its lower end flange is fixed to the base by bolts. A limiting shaft shoulder is provided at the upper end of the screw rod 201. During assembly, after the screw rod 201 passes through the through hole on the pressing plate 3, the buckle 203 is installed at the limiting shaft shoulder for fixing the pressing plate 3 and the screw rod 201. The buckle 203 is of a split type and is connected by bolts. By turning the hexagon head boss above the screw rod 201 to adjust the screwing length of the screw rod 201 and the nut sleeve 202, the distance between the pressing plate 3 and the base 1 can be changed, so as to adapt to planet carriers 9 and pins 10 of different sizes.

[0049] As Figure 1 shown, the column 4 is welded by several steel plates. The bottom plate of the column 4 is connected to the foundation by bolts. The cross beam 5 is also welded by steel plates. Both ends of the cross beam 5 are connected to the column 4 by bolts. The lower part of the cross beam 5 is connected to the hydraulic cylinder 6 by bolts. The selected hydraulic cylinder 6 provides a direct test load, which can not only achieve static multi-stage loading and pressure holding, but also provide high-frequency dynamic loads for fatigue load application. The test piece within a certain size range can be satisfied within the stroke range of the hydraulic cylinder 6. When the stroke of the hydraulic cylinder 6 exceeds the maximum range, the connection position between the cross beam 5 and the column 4 can be adjusted up and down according to different bolt holes, so as to achieve the purpose of adapting to test components of a wider range of different models and sizes.

[0050] As Figure 1 shown, the lower part of the hydraulic cylinder 6 is connected to the hinge pair 7 by bolts. The lower end surface of the hinge pair 7 is in contact with the upper end surface of the loading sleeve 8.

[0051] As Figure 2As shown in the figure, the hinge pair 7 is composed of an upper connecting seat 701, a lower connecting seat 702, a cylindrical pin 703 and a circlip 704. The cylindrical pin 703 passes through the upper connecting seat 701 and the lower connecting seat 702, and both ends of the cylindrical pin 703 are limited by the circlip 704. There is only a degree of freedom for rotation around the cylindrical pin 703 between the upper connecting seat 701 and the lower connecting seat 702. On the one hand, when there is a slight misalignment between the vertical axis of the hydraulic cylinder 6 and the horizontal axis of the pin shaft 10 due to machining or installation errors, that is, the two axes are not in the same plane, it can prevent the loading sleeve 8 from rotating around the pin sleeve 11 and maintain the stability of the device; on the other hand, the support of the pin shaft 10 and the pin sleeve 11 belongs to a cantilever structure. After loading, the axis will inevitably tilt slightly. The lower connecting seat 702 of the hinge pair 7 will automatically adapt and rotate around the cylindrical pin 703 to ensure that the lower end face of the lower connecting seat 702 and the upper end face of the loading sleeve 8 always remain in contact and no additional load is generated.

[0052] As Figure 2 shown, the loading sleeve 8 adopts a semi-circular design, which is convenient for installation and conforms to the force-bearing range of the planetary gear bearing. The inner diameter of the loading sleeve is the same as the outer diameter of the pin sleeve 11, and the outer diameter of the loading sleeve 8 is the same as the dedendum circle diameter of the planetary gear of the actual product. As Figure 3 shown, the left end face of the loading sleeve 8 abuts against the shoulder of the pin sleeve 11. A ring groove 801 is machined inside the loading sleeve at the non-load-bearing position, and a region with the same width as the planetary gear bearing is reserved to contact the pin sleeve to simulate the actual working state.

[0053] The above are all the preferred embodiments of this application. The protection scope of this application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A flexible pin test device, characterized in that: It includes a base (1), a mounting bracket, a loading mechanism, and a component to be tested; The component to be tested includes a planet carrier (9), a pin shaft (10), and a pin sleeve (11). The planet carrier (9) is arranged on the base (1). One end of the pin shaft (10) passes through the planet carrier (9) and is in interference connection with the planet carrier (9). One end of the pin shaft (10) passes through the pin sleeve (11) and is in interference connection with the pin sleeve (11); The loading mechanism is arranged on the mounting bracket and is used to apply a test load to the component to be tested. The loading mechanism is externally connected to a test device for analyzing deformation and fatigue.

2. The flexible pin test device according to claim 1, characterized in that: A guiding boss (101) is arranged on the top surface of the base (1), and a guiding groove (901) for the guiding boss (101) to pass through and slide is opened on the bottom surface of the planet carrier (9).

3. A flexible pin test device according to claim 2, characterized in that: An adjusting seat (12) is fixedly installed on the base (1). An adjusting screw (13) is arranged on the adjusting seat (12). A threaded hole (902) is opened on the side of the planet carrier (9) away from the pin sleeve (11). The adjusting screw (13) passes through the threaded hole (902) and is in threaded connection with the threaded hole (902).

4. A flexible pin test device according to claim 3, characterized in that: A rectangular groove (1202) and two U-shaped grooves (1201) are opened on one side of the adjusting seat (12). The rectangular groove (1202) is located between the two U-shaped grooves (1201), and the rectangular groove (1202) penetrates the top surface and the bottom surface of the adjusting seat (12); One of the U-shaped grooves (1201) is fixedly connected to the base (1) by passing through a bolt, and the other U-shaped groove (1201) is passed through by the adjusting screw (13). A hexagonal head and a screw shaft shoulder (1301) are arranged on the adjusting screw (13). The screw shaft shoulder (1301) is limited in the rectangular groove (1202).

5. The flexible pin test device according to claim 1, characterized in that: A pressing plate (3) is connected to the base (1) through a lead screw (2). The lead screw (2) is arranged at the four corners of the base (1). The pressing plate (3) is located above the planet carrier (9) and is used to press the planet carrier (9) against the base (1); The lead screw (2) includes a screw rod (201), a screw sleeve (202), and a buckle (203). The screw sleeve (202) passes through the base (1) and is fixedly connected to the base (1). The bottom end of the screw rod (201) is in threaded connection above the screw sleeve (202). A limiting shaft shoulder and a hexagonal boss are arranged at the upper end of the screw rod (201). The hexagonal boss is located above the limiting shaft shoulder; The buckle (203) is clamped on the screw rod (201) and is located above the limiting shaft shoulder. The pressing plate (3) is located between the buckle (203) and the hexagonal boss.

6. The flexible pin test device according to claim 5, wherein: The buckle (203) is of a split structure and is connected by bolts.

7. A flexible pin test device according to claim 1, characterized in that: The mounting bracket includes a cross beam (5) and columns (4). Multiple groups of bolt holes are arranged on the columns (4) along the height direction of the columns (4). The two ends of the cross beam (5) are detachably connected to the bolt holes by bolts. The loading mechanism is arranged on the bottom surface of the cross beam (5) and faces the pin sleeve (11).

8. A flexible pin test device according to claim 1, characterized in that: The loading mechanism includes a hydraulic cylinder (6), a hinge pair (7), and a loading sleeve (8); The hydraulic cylinder (6) is fixedly connected to the bottom surface of the cross beam (5); The hinge pair (7) includes an upper connecting seat (701), a lower connecting seat (702), a cylindrical pin (703) and a circlip (704). The upper connecting seat (701) is fixedly connected to the piston rod of the hydraulic cylinder (6). The cylindrical pin (703) passes through the upper connecting seat (701) and the lower connecting seat (702), and both ends of the cylindrical pin (703) are limited by the circlip (704); The upper end surface of the loading sleeve (8) is in contact with the lower end surface of the lower connecting seat (702), and the loading sleeve (8) is sleeved on the pin sleeve (11).

9. The flexible pin test device according to claim 8, characterized in that: The loading sleeve (8) is semicircularly arranged. The inner diameter of the loading sleeve (8) is adapted to the outer diameter of the pin sleeve (11), and the outer diameter of the loading sleeve (8) is adapted to the root circle diameter of the planet gear.

10. A flexible pin test device according to claim 8, characterized in that: A shoulder is provided at one end of the pin sleeve (11) close to the planet carrier (9), and one end of the loading sleeve (8) close to the planet carrier (9) abuts against the shoulder; A processing ring groove (801) is provided in the loading sleeve (8) at the non-bearing position.

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